CN102828189B - Cathodic protection potential control device and method - Google Patents
Cathodic protection potential control device and method Download PDFInfo
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- CN102828189B CN102828189B CN201210320639.9A CN201210320639A CN102828189B CN 102828189 B CN102828189 B CN 102828189B CN 201210320639 A CN201210320639 A CN 201210320639A CN 102828189 B CN102828189 B CN 102828189B
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- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention provides a cathode protective potential control device and method. The device comprises a potential control module, a plurality of power modules, and a plurality of potential detecting modules, wherein the number of the power modules is the same as the number of the potential detecting modules, all power modules are provided with power module controllers and power circuits; a signal detecting negative electrode end and a positive electrode end of each potential detecting module are connected with a protected metal structural component and a reference electrode; and the potential control modules are connected with all power module controllers and communication ports of the potential detecting modules through communication ports. The method comprises the following steps: the plurality of power modules output the voltage through related power module controllers under the voltage closed-loop control; the voltage feedback signals are directly acquired from the output ports of the power circuits in each power module by measuring; and the cathode protective potential control between each protected metal structural component and the corresponding reference electrode is achieved under the potential closed-loop control of the potential control modules. With adoption of the device and the method, the wire harness, the arrangement of wires and the complexity in control of the cathode protective power system can be simplified.
Description
Technical field
The present invention relates to special power supply control field, particularly relate to a kind of control method of galvanic protection power-supply system.
Background technology
In antiseptic project, impressed current cathode protection technology is widely used in stoping the corrosion of hardware, for example, and anticorrosion for to metal construction groups such as oil extraction in oil field district tank farm, oil transportation or gas pipe lines.The existing single channel output direct supply that adopts phase controlled rectifier or switch converters that mostly is for galvanic protection rot-resistant power-supply system; to a plurality of adjacent protected metal construction power supplies that connect with electrical conductor in protected metal construction group, with a reference utmost point, detect cathode potential.On current path between protected of metal construction and anode, comprise the equivalent resistance between the local equivalent resistance of a plurality of metal inside and a plurality of metallic surface and soil ionogen; due to the conductive structure difference of protected of metal construction, coating difference and contact soil diversity, various equivalent resistances are not etc.For given current density; when electric current is larger; the pressure drop of each local equivalent resistance differs greatly; thereby; with single DC power supply and single-point potentiometric detection in the situation that; in protected of large metal construction, current potential can not obtain balanced control, is difficult to make protected each point of metal construction in best guard mode.In addition, existing galvanic protection anticorrosive power, is directly with wire, protected metallic cathode to be connected with power-supply controller of electric with the reference utmost point to the signals collecting mode of current potential.Conventionally; power module is away from protected hardware and the reference utmost point; power module is measured electric potential signal through longer wire; owing to connecting the impact of the distribution parameters such as wire resistance and inductance and parameter variation thereof; can make the reference electrode potential and the actual value that detect have error; thereby make control of Electric potentials occur deviation, cause the guard mode of protected off-target of metal construction.
No. ZL201020220448.1, Chinese patent, on February 9th, 2011 disclosed scheme, has adopted Modular electrical source structure and current potential digitizing to detect to carry out the corrosionproof protection of multiple spot hardware to overcome the problems referred to above; In this scheme, because each power module adopts independently current potential feedback loop, the telecommunication cable wire harness of power-supply system is many, makes system wiring complicated, makes troubles to the installation and maintenance of anticorrosive power system; On the other hand, at power control room, during away from hardware, many long range measurements cables are also uneconomical.
The potential control method of existing galvanic protection power-supply system, except adopting open loop controls, most power modules adopt independently current potential feedback loop, by the controller of power module, directly carry out control of Electric potentials.When adopting digital control technology anticathode protection power source to carry out control of Electric potentials; thisly by power module controller, both carried out power conversion control; carry out again the control method that voltage and current potential regulate, make power module control software design and become complicated, unfavorable batch production debugging simultaneously.
Summary of the invention
Technical problem to be solved by this invention is: a kind of cathodic protection potential control device is provided, to overcome each power module, adopt independently current potential feedback loop, the telecommunication cable wire harness of power-supply system is many, system wiring is complicated, the problem of the installation and maintenance inconvenience of power-supply system; A kind of cathodic protection potential control method is also provided, the control task of power module is simplified, be beneficial to batch production debugging.
The present invention solves its technical problem and adopts following technical scheme:
Cathodic protection potential control device provided by the invention, is by a control of Electric potentials module, and equal a plurality of power modules and the potentiometric detection module composition of quantity, wherein: all power modules are equipped with power module controller and power circuit; In each power circuit, its negative pole is connected with protected hardware by wire, its anodal and ground connection anodic bonding; The signal detection negative pole end of described potentiometric detection module is connected on protected hardware, and its signal detection positive terminal is connected with the reference utmost point; Described control of Electric potentials module is connected with the communication interface of all power module controllers through communication interface, through communication interface, is connected with the communication interface of all potentiometric detection modules.
Described control of Electric potentials module, can through two groups independently null modem cable be connected with potentiometric detection module with power module respectively.
Described control of Electric potentials module, can also be connected with potentiometric detection module with power module through one group of null modem cable.
Described a plurality of power modules, can be for according to reference voltage data separately, and output voltage is separately carried out to voltage feedback control, produce and put on the controlled volts DS of multichannel that protected hardware carries out galvanic protection.
Described control of Electric potentials module is carried out electric potential signal sampling for periodicity initiate potential detection module and is received the potentiometric detection data of each potentiometric detection module, according to the reference potential value of setting, carry out the computing of current potential feedback control, to sending reference voltage data with the corresponding power module of potentiometric detection module.
Described a plurality of potentiometric detection modules, for detection of the protected hardware connecting with corresponding power module and the electric potential signal between its reference utmost point.
Cathodic protection potential control method provided by the invention, specifically: the output voltage of a plurality of power modules adopts voltage close loop to control realization by power module controller separately, voltage feedback signal is directly in the power circuit output end mouth measurement acquisition of power module inside separately, each protected hardware is controlled with the cathodic protection potential between the corresponding reference utmost point, by control of Electric potentials module, adopt current potential closed-loop control to realize, feeding back potential data measures and obtains by being positioned near corresponding current potential detection module protected hardware, and be sent to control of Electric potentials module with serial communication mode, control of Electric potentials module is carried out the computing of current potential feedback control and is produced corresponding reference voltage data by the setting reference potential value of each protected hardware, and with serial communication mode, above-mentioned reference voltage data are sent to corresponding power module controller, the reference value that above-mentioned reference voltage data are carried out voltage close loop control for power module.
Above-mentioned cathodic protection potential control method, it can comprise the following steps:
(1) control of Electric potentials module sends electric potential signal sampling instruction to potentiometric detection module;
(2) the cathodic protection potential signal between the protected hardware of potentiometric detection module samples and the reference utmost point obtain potentiometric detection data;
(3) above-mentioned potentiometric detection data are sent to control of Electric potentials module with serial communication mode;
(4) control of Electric potentials module compares above-mentioned potentiometric detection data and the corresponding reference potential value of setting, and by feedback control algorithm, above-mentioned relatively difference is carried out to computing, generating reference voltage data;
(5) above-mentioned reference voltage data are sent to power module with serial communication mode;
(6) power-supply controller of electric in power module is measured the virtual voltage of power circuit output end, and actual voltage value and above-mentioned reference voltage data are compared, and by feedback control algorithm, power circuit output voltage is regulated to control;
Through above-mentioned steps, realize the control of anticathode protection potential.
In above-mentioned steps (1), control method to the potentiometric detection data of feedback can be: the sampling period of potentiometric detection data is determined by control of Electric potentials module, by control of Electric potentials module, to potentiometric detection module, send electric potential signal sampling instruction, the transmission of activation potential detection module to the sampling of electric potential signal and potential data.
In above-mentioned steps (5), to current potential feedback, can be: the current potential feedback control cycle is determined by control of Electric potentials module periodically to power module, to send reference voltage data by control of Electric potentials module.
The present invention compares with method with the cathodic protection potential control device of current employing, has advantages of following main:
One, has simplified the wire harness of galvanic protection power-supply system and the complexity that connects up;
Adopt null modem cable that control of Electric potentials module is connected with the potentiometric detection module of a plurality of protected hardwares; telecommunication cable wire harness when having overcome each power module and adopting current potential feedback loop is independently many; less economical, wiring is complicated, the defect of installation and maintenance difficulty.
Its two, simplified the control complexity of power module:
By control of Electric potentials module, gathered the potential data of a plurality of protected hardwares; carry out current potential closed-loop control computing; the method transmitting control signal to corresponding power module; be conducive to, in control of Electric potentials, the electric potential signal of potentiometric detection module is adopted to unified acquisition and processing mode; simplify power module closed-loop control task; be conducive to reduce power module and control software complexity, overcome the defect of power module batch production debug difficulties.
Accompanying drawing explanation
Fig. 1 is the structural representation for cathodic protection potential control device according to an embodiment of the present invention.
Fig. 2 detects and sends the schema of potential data for potentiometric detection module according to one embodiment of the present invention.
Fig. 3 is the schema that obtains potential data according to one embodiment of the present invention for control of Electric potentials module and produce reference voltage data.
Embodiment
Below in conjunction with specific embodiments and the drawings, the invention will be further described, but do not limit the present invention.
One. cathodic protection potential control device
As shown in Figure 1, by a control of Electric potentials module, and a plurality of power modules and potentiometric detection module that quantity equates form the structure of this cathodic protection potential control device, wherein: all power modules are equipped with power module controller and power circuit.In each power circuit, its negative pole is connected with protected hardware by wire, its anodal and ground connection anodic bonding.The signal detection negative pole end of described potentiometric detection module is connected on protected hardware, and its signal detection positive terminal is connected with the reference utmost point.In the present embodiment, described control of Electric potentials module through two groups independently null modem cable be connected with a plurality of potentiometric detection modules with a plurality of power modules respectively, be that described control of Electric potentials module has two communication interfaces, one of them communication interface is connected with the communication interface of all power module controllers, and another communication interface is connected with the communication interface of all potentiometric detection modules.
Described power module is connected through null modem cable with control of Electric potentials module, and null modem cable is for transmitting reference voltage data and mutually transmitting out of Memory from control of Electric potentials module to power module; This power module is for according to reference voltage data separately, and output voltage is separately carried out to voltage feedback control, produces and puts on the controlled volts DS of multichannel that protected hardware carries out galvanic protection.In this power module, its power circuit is the ordinary tap type electric power convertor circuit that adopts power electronic devices field effect transistor to form, for unsteered interchange or the DC voltage conversion of input are become to controllable volts DS; Its power module controller is the power converter controller consisting of general single chip and general pwm chip.
Described potentiometric detection module, the protected hardware being connected with respective electrical source module for correspondence detection and the electric potential signal between its reference utmost point; This potentiometric detection module is connected through null modem cable with control of Electric potentials module, null modem cable sends take-off potential signal sampling instruction and to control of Electric potentials module, transmits potentiometric detection data for potentiometric detection module to potentiometric detection module for control of Electric potentials module, and for mutually transmitting out of Memory.Electric potential signal sample circuit in potentiometric detection module is general mimic channel, and described current potential sampled signal becomes potentiometric detection data by digital processor processes, then by null modem cable, sends to control of Electric potentials module through communication interface.
Described control of Electric potentials module, be used for the potentiometric detection data that periodicity initiate potential detection module carries out electric potential signal sampling and receives each potentiometric detection module, according to the reference potential value of setting, carry out the computing of current potential feedback control, produce reference voltage data, these reference voltage data are sent to and the corresponding power module of potentiometric detection module through null modem cable.In the present embodiment, control of Electric potentials module can be the SCM system with dual serial communications interface unit, for example, be the general single chip system that has two CAN bus controller interfaces.
Cathodic protection potential control device provided by the invention, its working process is: the output voltage of each power module adopts voltage close loop to control realization by power module controller separately, and voltage feedback signal is directly in the power circuit output end mouth measurement acquisition of power module inside separately, each protected hardware is controlled with the cathodic protection potential between the corresponding reference utmost point, by control of Electric potentials module, adopt current potential closed-loop control to realize, feeding back potential data measures and obtains by being positioned near corresponding current potential detection module protected hardware, and with serial communication mode, be sent to control of Electric potentials module through null modem cable, control of Electric potentials module is carried out the computing of current potential feedback control and is produced corresponding reference voltage data by the setting reference potential value of each protected hardware, and by null modem cable, above-mentioned reference voltage data are sent to corresponding power module with serial communication mode, the reference value that above-mentioned reference voltage data are carried out voltage close loop control for power module.
Two. cathodic protection potential control method
Above-mentioned cathodic protection potential control device provided by the invention can be realized the control of cathodic protection potential.
For ease of explanation, referring to Fig. 1, the present embodiment respectively arranges five by a plurality of power modules and potentiometric detection module, that is: the identification number of five power modules is respectively 1,2,3,4,5, the corresponding identification number of five potentiometric detection modules is identical with the identification number of power module, is also respectively 1,2,3,4,5.The identification number information that contains this potentiometric detection module self in the potentiometric detection Frame that sends to control of Electric potentials module 101 by potentiometric detection module 110, for identifying the source of potentiometric detection data in control of Electric potentials module 101.The identification number that contains power module in the reference voltage Frame that control of Electric potentials module 101 sends to power module 103, for representing that these reference voltage data should be received by the power module identical with this identification number.Serial communication is multiple host pattern, sampling unification and fixing data layout.The identification number of the electric potential signal sampling director data frame that control of Electric potentials module 101 sends to potentiometric detection module 110 is 0,1,2,3,4,5; Wherein, the electric potential signal sampling director data frame that identification number is 0 sends with potential data for starting the electric potential signal sampling of identification number 1 potentiometric detection module.So the electric potential signal sampling of the potentiometric detection module of identification number k and the Frame of the involved identification number k-1 of potential data process of transmitting activate.
Cathodic protection potential control method provided by the invention, is detect and send potential data method for potentiometric detection module, and its flow process as shown in Figure 2.Suppose to be performed in potentiometric detection module that this flow process is k at identification number.This flow process starts from step S201.Then, at step S202, potentiometric detection module receives the Frame that contains identification number with serial communication mode.Control of Electric potentials module sends the electric potential signal sampling initial order of identification number 0 to potentiometric detection module, electric potential signal sampling and the potential data that can activate all potentiometric detection modules send.
At step S203, the identification number of the Frame that step S202 is received judges, if the identification number of the Frame receiving is number less by 1 than potentiometric detection module self identification, the identification number that is the Frame that receives of identification number k potentiometric detection module is (k-1), and flow process enters step S204; Otherwise flow process enters step S206.
At step S204, the cathodic protection potential signal between the protected hardware of potentiometric detection module samples and the reference utmost point also obtains potentiometric detection data.
At step S205, potentiometric detection module is sent to control of Electric potentials module by the above-mentioned potentiometric detection data that comprise self identification k with serial communication mode, for carrying out current potential closed-loop control.Meanwhile, these potentiometric detection data are also received by other potentiometric detection module, can start the potentiometric detection module that the next one has adjacent identification number and carry out electric potential signal sampling and the transmission of potentiometric detection data.
At step S206, flow process finishes.
Cathodic protection potential control method provided by the invention, is the method for potential data and generation reference voltage data of obtaining for control of Electric potentials module, and its flow process as shown in Figure 3.This flow process starts from step S301.At step S302, remove potentiometric detection data buffer, prepare to receive the potentiometric detection data in this control of Electric potentials cycle.This buffer zone is for preserving the potentiometric detection data of all corresponding potentiometric detection module that one-period receives.
At step S303, the interruption that receives serial communication data is opened, and interrupts allowing.Like this, when serial communication data of the every reception of control of Electric potentials module, all can be processed and receive by data sink interrupt routine, and deposit according to the order of sequence above-mentioned potentiometric detection data buffer.
At step S304, control of Electric potentials module sends the electric potential signal sampling instruction of identification number k=0 to potentiometric detection module.Potentiometric detection module receives after this instruction, and identification number 1 potentiometric detection module is by the cathodic protection potential signal between sampling protected hardware and the corresponding reference utmost point and obtain potentiometric detection data.
At step S305, identification number storage unit values is made as to k=1, using and as reading potential, detect the pointer value of data buffer, the potentiometric detection data of sending for reading the potentiometric detection module of received identification number k.
At step S306, in potentiometric detection data buffer, by identification number cell value k, be address pointer value, read the potentiometric detection data that the potentiometric detection module of received respective identification number is sent.
At step S307, judge whether above-mentioned potentiometric detection data are valid data, if valid data, flow process enters S308; Otherwise flow process enters S310.
At step S308, control of Electric potentials module compares effective potentiometric detection data and the corresponding reference potential value of setting, and by feedback control algorithm, above-mentioned relatively difference is carried out to computing, generating reference voltage data.
At step S309, the above-mentioned reference voltage data that comprise identification number k are sent to power module with serial communication mode.Power-supply controller of electric in power module is measured the virtual voltage of power circuit output end, and actual voltage value and above-mentioned reference voltage data are compared, and by feedback control algorithm, power circuit output voltage is regulated to control.
At step S310, carry out overtime judgement, if do not receive effective potentiometric detection data within predetermined time, flow process is got back to step S306; Otherwise flow process enters step S311.
At step S311, to potentiometric detection module, send the electric potential signal sampling instruction that comprises identification number k; This instruction is for making the potentiometric detection module of identification number k+1 carry out electric potential signal sampling and potential data transmission.
At step S312, to power module, send the reference voltage data of the last computation of Period that comprises identification number k.Owing to not receiving the potentiometric detection data of the potentiometric detection module of effective identification number k, by the reference voltage data that last time calculated for corresponding power module is carried out to voltage close loop control.
At step S313, identification number storage unit values add one operation, i.e. k=k+1.
At step S315, judge whether 5 control of Electric potentials tasks complete.If do not completed, flow process turns back to step S306.Otherwise flow process enters step S315.
At step S315, forbid that the data sink of control of Electric potentials module is interrupted.
At step S316, fault is processed.For example, continuously n cycle all do not receive the potentiometric detection data of same identification number potentiometric detection module, may be that this identification number potentiometric detection module breaks down, can display alarm etc.
At step S317, flow process finishes.
The flow process of Fig. 3 has been described control of Electric potentials module and whole cathodic protection potentials has been carried out to the current potential closed-loop control of one-period.Visible, the sampling period of potentiometric detection data is determined by control of Electric potentials module, by control of Electric potentials module, to potentiometric detection module, sends electric potential signal sampling instruction, the transmission of activation potential detection module to the sampling of electric potential signal and potential data.The current potential feedback control cycle is determined by control of Electric potentials module, by control of Electric potentials module, periodically to power module, sends reference voltage data.
In above-described embodiment; cathodic protection potential control device provided by the invention; that a plurality of potentiometric detection modules are connected to control of Electric potentials module with same telecommunication cable; overcome each power module and adopted independently current potential feedback loop, the telecommunication cable wire harness of power-supply system is many, system wiring is complicated, the problem of the installation and maintenance inconvenience of power-supply system.
In above-described embodiment; cathodic protection potential control method provided by the invention; it is for multiple spot cathodic-protection system; the on-the-spot potential data of all protected hardwares is gathered by control of Electric potentials module; control of Electric potentials module is carried out closed-loop control computing to potential data; the reference voltage signal of generation is occurred to corresponding power module, by power module, carry out voltage close loop control.So the control task of power module is simplified, has overcome power module and controlled software design complexity, the weakness of batch production debug difficulties.
Although above-described embodiment has been described embodiments of the present invention by reference to the accompanying drawings, those of ordinary skills can make various distortion or modification within the scope of the appended claims.
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